PoLYCERA. MOLLUSCA. BRANCHIFERA. S85 
136. D. quadricornis . — Cloak smooth in the middle, with a 
row of obsolete tubercles on each side ; tentacula approximat- 
ing in pairs. 
Mont. Linn. Trans, xi. 17* t. iv. f. 4. — Coast of Levon. 
Length |ths of an inch, mottled with brown and white ; tentacula long, 
slender ; branchial plumes about 8 in number. 
137. T>. nigricans . — Cloak thickly covered with short lan- 
ceolate tubercles ; branchial plumes about 8 in number. 
Flem. Edin. Encyc. vol. xiv. p. 618.— -Zetland. 
Length about half an inch, pale, freckled with dusky ; cloak emarginate 
anteally ; sheath of the superior tentacula notched in the margin. 
Gen. XXXVI. POLYCERA. — Oral, tentacula exceeding 
two in number ; branchiae, when at rest covered, by two 
scales. 
138. Y.Jlava. — Oral, tentacula four ; superior tentacula awl 
shaped; branchial scales smooth, produced. 
Doris flava, Mont. Linn. Trans, vii. 79* t. vii. f. 6.— Coast of Devon. 
Length upwards of half an inch, narrow behind ; body spotted with bright 
orange yellow ; branchial plumes 7 in number, behind which are the long 
scales or fleshy appendages. 
139- P. pennigera. — Upper tentacula subclavate, perfoliate, 
with a bifid basilar sheath. 
Doris penn. Mont. Linn. Trans, xi. 17. t. iv. f. 5. — Devon coast, rare. 
Length an inch ; bifid anteally, acuminated behind ; spotted with orange 
and black ; branchial plumes 5, with two bifid appendages.— -The absence of 
the oral tentacula, and the peculiar character of the superior ones, and of the 
branchial appendage, mark this species as the type of a new genus, which may 
be termed The cage ra. 
In 1814 I observed an animal in a pool among the rocks on the shore near 
Aberbrothock, Angus-shire, which probably belonged to the genus Polycera^ 
but which I was unable to secure. The oral tentacula were 6 in number ; 
the superior tentacula produced, and beautifully pinnate ; the branchial plumes 
were numerous ; body wide before, becoming very narrow behind the vent. 
Gen. XXXVII. TERGIPES.— Branchiae, furnished with 
a sheath at the base, in a single row on each side, and ca- 
pable of acting as suckers., 
140. T. maculatus. — Branchi^, 4 on each side and 1 near 
of the body, consisting of a clavate sheath with 
largin, and a concave summit with a central pa- 
Doris maeulata, Mont. Linn. Trans, vii. 80. t. vii. f. 8, 9. — Coast of 
Devon. 
the extremity 
a sexpartite i 
pilla. 
